Machine for grading and purifying middlings



5' sheets-sheet 1.

(No Model.)

J. M. SCHUTZ. MACHINE FOR GRADING AND PURIPYING MIDDLINGS.

Patented May zo. 1884@ a Y .raf Illu F u 4 noi o Mww Mesas QMCZM N PETERS, Phmu-LulwgrapmwY wuhmgwn. D. C.

(No Model.) 5 Sheets-Sheet 2.

J. M. SCHUTZ. MACHINE FOR GRADING AND PUVRIPYING MIDDLINGS. No. 298,900. Patented May 20, 1884.

a Y r l .@l

o A o f' O O @A o o o o l @A o A O n asses.

5 lSheets-Sheet 3.

(No Model.)

J. M. SCHUTZ.

MACHINE FON GRADING AND PUNIPYING MIDDLINGS.

AM 8 OO l 0l 2 1 y m. n@ M d 6 Llu n e t na P lfuv# i .rv-v #Mu ....h L l L C 0 Vf 0 U i t. E A ,C MJ: Wim A 0. w. V E M .a 2 5. m M N n Essis.

mk, M

(No Model.) 5 sheets-sheet 4.

' J. M. SCHUTZ.

MACHINE PQR GRADING AND PURIFY'ING MIDDLINGS. No. 298,900. A Patented May 20, 1884.

N` PEYERS. PhowLimagrwnen washing D. C.

(No Model.)

5 Sheets- Sheet 5.

J. M. SCHUTZ,

MACHINE FOR GRADING AND PURIPYING MIDDLINGS. No. 298,900.

Patented May 20, 1884.

6 A en Alim v 1, A13

. A ,l /f

ltlnrrnn Bizarre Partnr Ormea.

JOSEPH MARTIN SCHUTZ, OF MINNEAPOLIS, MINNESOTA.

MACHINE FOR GRADING AND PURIFYING NIIDDLINGS.

SPECIFICATION forming part of Letters Patent No. 298,900, dated May 20, 1884.

' Application filed September 10, 1983. (No model.)

T a/ZZ whom, it may concern,.-

Beit known that I, Josnrr-r MARTIN SonU'rz, a citizen of the United States, and a resident of Minneapolis, in the county of Hennepin, in

the State of Minnesota, haveinvented certain new and useful Improvements in Machines for Grading and Purifying Middlings,of which the following specification is a full, clear, and exact description, reference being also had to the accompanying drawings, in which- Figure l is a longitudinal sectional elevation, and Fig. 2 is a plan View,` and Fig. 3 is an outside side elevation, of the grader. Fig. 4 is an enlarged perspective view of a section of the combined elevating and brushing belt.

Fig. 5 is a rear end elevation of the grader, with portions broken out to show the interior arrangement of the mechanism. Fig. 6 is a view, reduced, of the grader and system of purifiers, showing their relative arrangements. Fig. 7 is a sectional side view, Fig. 8 is a sectional plan view, and Fig. 9 is a cross-sec tional view, of the system of purifiers. Fig. l0 is an enlarged view of a section of thepnrifier separating-shal'cer.

In this machine themiddlings are separated into grades according to size by passing them over screens of bolting-cloth of different degrecs of fineness, and without the use of artiiicial air-currents, and then the impurities are removed from each of said grades separately by passing them over screens of ribbed metal and subjecting them to the action of artificial air-currents.

In the drawings, A is the frame-work ofthe grader, wi thin which are suspended, one above the other, by hangers a, a series of boltingcloth-covered screen-frames, B.

C is the feed-hopper, through which all the material entering the machine is fed to the upper screen, B, as shown. Each of the screens B is provided with a spout, b, by which the tailings77 of each screen is removed from the machine separately and conveyed to a separate purifier, as hereinafter shown. Beneath each screen B is an endless traveling canvas or other suitable belt, D, each belt provided with a brush, E, and a series of parallel bars or strips, d. (See Fig. 4.) The screens B are set with a downward slanttoward their tail ends, so that the material will flow down them more easily, andthe belts D will be set parallel with them and revolved,so that their uppersurfaces will move from the tail toward the head ends of the screens; hence all the material which falls through the boltingcloth will be caught by the belts and deposited upon the head end of the next screen. The material which falls through the lower screen will be of such a fineness and comparatively pure quality that it will be deposited in a hopper, e, and conveyed direct to the finishing rolls or stones. Ordinarily ten of these screens Bwill be used, as shown, although a greater or less number may be used. The upper screen will be clothed with No. 00 cloth, the second with No. O cloth, the third with N o. l cloth, the fourth with No. 2 cloth, and so on, increasing infineness from the top to the bottom, as indicated in Fig. l. By this means the coarser grades arc separated first and the finer grades separated last. The brushes E serve to wipe the adhering dust loose from the cloth of the screens, and thus prevent clogging. Strips will be attached to the inside of the casing A, to support the belts D and prevent them sagging. The two upper screens, B, will be connected together by a yoke or strap, g', to which is attached another strap, g2, between which straps an eccentric, g3, on a shaft, F', runs. The shaft F is jonrnaled across the end of the frame A, as shown, by which means the screensmay be vibrated. Each pair of the remaining screens is similarly vibratcd, as shown, the eccentric shafts being arranged on opposite ends of the frame A, and all driven by one single belt, G, running up over an idler, G2, on an idler-shaft, G3, on the frame A, and then alternately back and forth over pulleys GrL on the eccentric-shafts, as shown in Fig. 3. On the opposite end of the idler-shaft Gr3 is a small pulley, G, from which a belt, G5, runs to the feed-roll shaft G6, by which the feed- :roll is operated. Upon the outer end of this feed-roll shaft GG is a miter-gear, h, engaging witha similar miter-gear, h2, ou an upright shaft, h, journaled upon the side of the frame A, as shown in Fig. 4:. Upon this shaft h3, opposite the head end of each of the shafts of the drums over which the belts D run, is a miter-gear, h, engaging with similar gear, h5, on the shaft of said endless-belt drums. By

j 4 or other means, L. 'Ihe floors of these frames K are formed of inclined sheet-metal plates m, each plate formed with serrations crosswise of the frames K,as shown in Fig. 9,and with narrow openingsabetween each pair of the plates.

The serrations in the plates are of ratchet form, so that when the middlings are fed to the rapidly-vibrating frames K the long inclined edges of the serrations will slip beneath the middlings when the platesl m are moving in one direction, and the short upright front sides of the serrations will catch the middlings and carry them along at the return-stroke, thereby gradually moving them along the frame K and causing them to fall from plate to plate m.

Above each alternate partition H2 is a fan, M', connected by ports M2 with the two coinpartments over which the fans sit, Vso that each fan will exhaust the air from two compartments. Valves M3 will be arranged in each port M2, to regulate the force of the currents. By this means artificial air-currents are drawn up through the slits a between the plates m, so that when the middlings fall over the edges of the plates m in their progress along the frame K the lighterimpurities will be removed therefrom and carried off through the fans, while the pure middlings only will pass over the tails ofthe frames K. Ihe tailings from each of the screens B of the grader will be rugn to one of the frames K, as shown in Fig. 5so that each frame K will be supplied with a separate grade of middlings.

Across the tail end of the frame H' are a series of ccnveyers, N, (live being shown, but a greater or less number maybe used,) into which the tailings from the frames K will be run and Aconveyed away from the machine for further treatment in their reduction into flour. In the drawings the coarscst grade of middlings will be run from the screen K to the lower conveyer,

N, the second coarsest to the second conveyer, the third coarsest to the third conveyer, the fourth coarsest to the fourth conveyer, and all the remainder to the upper conveyer. The discharge-spouts will be arranged with suitable slides to vary this arrangement, if necessary. By these simple arrangements all the middlings from all the rollers or stones are fed to the grader A, and from thence each` separate grade conveyed to its own separate purifierframe K, where theimpurities are removed and the middlings rendered suitable for the after steps in the processes of reduction into flour.

Having described my invention and set forth its merits, what I claim isl. 'Ihe combination of a close case, A, a series of bolting-screens, B B, suspended in the case, and increasing in ineness from the uppermost to the lowermost, means for agitating the screens, and endless belts D D under the several screens, and provided with slots d d and brushes E E, substantially as specified.

2. The combination of a purifying-case, H', divided by partitions H2 H2 into compartments, separate fans M' M', connected with different compartments of the case, ratchet-faced plates K' K' in the severalcompartments, and means for agitating the said frames, for the purpose speciied. f

3. The combination of a series of shakingscreens successively increasing in neness from the uppermost to the lowermost, means for conveying the screenings from one screen to another, separate means for conveying the tailings ofthe several screens, separatepurifying-chambers, ratchet-surfaced shaking-frames in the respective purifying-chambers, and a series of fans communicating separately with the purifying-chambers, substantially as herein specified.

In testimony whereof I have hereunto set my hand in the presence ot' two subscribing Witnesses.

G. N. WooDwARD, LoUIs FEEsER, Sr. 

